Use mysqld instead of mysqld_safe (mysqld_safe not necessary for 5.7)
Use mysqld --initialize-insecure instead of mysql_install_db
Create /var/lib/mysql-files (used by secure-file-priv)
http://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html#sysvar_secure_file_priv
Remove unnecessary Perl dependencies (mysqlhotcopy was removed in 5.7)
Thanks Norvald H. Ryeng